Marine Plankton from the East-Greenland Sea. 



297 



to the arctic variety of P. urnula characterized (in spite of its name) 



by a less acute lower end of the house and smaller size. It forms 



a transition to the above mentioned species. 



Di strib, (of var. acuta) Davis Strait; (main species) northern oceanic 

 species. 



Tiiitinnus Schrank, 1803. 



7. Tintinnus acuminatus Clap. & Lachm., var. secatus Brandt, 

 1906, p. 32, pi. 66, fig. 5; 1907, p. 389; T. secatus Brandt, 1896, p. 51, 

 pi. 3, fig. 12. 



Only found once in a sample from the outer part of the pack- 

 ice (Aug. 1906). 



Di strib, (of var. seco/ns) Karajak Fjord, Davis Strait, Labrador Stream; 

 (main species) northern oceanic species of wide distribution. 



8. Tintinnus norvegicus (Daday) Brandt, var. gracilis Brandt, 

 1906, p. 30, pi. 62, figs. 2, 7; 1907, p. 407; T. gracilis Brandt, 1896, 

 p. 54, pi. 3, fig. 7. 



The form of the group T. norvegicus present in the area has the 

 cylindrical shape of the house and the well-developed teeth of the 

 mouth, characterizing Brandt's T. gracilis. 



It was found in the samples from the pack-ice in August 1906 



and in July 1908 and further outside the ice in August 1908; it was 



always rather rare, but because of its small size it is only to a 



small degree kept by the nets. 



D i strib, (of the var. grac/V/s): Karajak Fjord, Davis Strait; (of the main 

 species) Davis Strait, Labrador Stream, North Atlantic, off Bergen. 



9. Tintinnus vitreus Brandt, 1896, p. 54, pi. 3, figs. 8—9; 1906 

 -07, p. 438, pi. 66, fig. 7. (Fig. 7). 



Fig. 7. Tintinnus vitreus IJrandt. 250 t. m. 



In his paper on the Tintinnodea from Vanhöffen's material 

 from Karajak Fjord Brandt has described a rare Tintinnus which 



